199999808 has 14 divisors (see below), whose sum is σ = 396874746. Its totient is φ = 99999872.

The previous prime is 199999777. The next prime is 199999819. The reversal of 199999808 is 808999991.

It can be written as a sum of positive squares in only one way, i.e., 199600384 + 399424 = 14128^2 + 632^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1562435 + ... + 1562562.

Almost surely, 2^199999808 is an apocalyptic number.

It is an amenable number.

199999808 is a deficient number, since it is larger than the sum of its proper divisors (196874938).

199999808 is an equidigital number, since it uses as much as digits as its factorization.

199999808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3125009 (or 3124999 counting only the distinct ones).

The product of its (nonzero) digits is 3779136, while the sum is 62.

The square root of 199999808 is about 14142.1288355042. The cubic root of 199999808 is about 584.8033605054.

The spelling of 199999808 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, eight hundred eight".